ISPConfig install failure

I recently installed ISPConfig on CentOS 4.3 using perfect setup etc. and got it to work first time except when trying to install Joomla on a domain, the Joomla install showed me that there was no MySQL support available. After many late nights looking through forums I decided to reinstall everything. After running through perfect setup, I checked PHP/MySQL support, everything OK. So onto ISPConfig, everything OK. It all seems to install OK however I am unable to bring up the ISPConfig login page. If I hit the IP address of the install I get the Apache/CentOS default page rather than the ISpConfig shared IP page. From this I would assume ISPConfig is not running, however if I stop and start the ISPConfig service it shows as starting.

I have reinstalled 4 times this week and still get the same problem!!
I am very new to this and obviously need some help.

I think you only had to enable a mySQL database for that website via the basic tab of the site in ISPConfig.
After that, you could click on the options tab and define a database for Joomla.
Via PHPmyAdmin you could drop the MySQL dump (provided by Joomla) into the field for that website.

but did not delete the old ISPConfig database before you installed ISPConfig again.
Please delete those directories again, and also delete the ISPConfig database, and then try to install ISPConfig again.